D-Link DFL-CPG310 Product Manual - Page 127
Configuring VLANs, IP Address, Subnet Mask, Apply
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Configuring Network Settings 4. In the IP Address field, type the IP address to use as the OfficeMode network's default gateway. Note: The OfficeMode network must not overlap other networks. 5. In the Subnet Mask text box, type the OfficeMode internal network range. 6. If desired, enable or disable Hide NAT. See Enabling/Disabling Hide NAT on page 107. 7. If desired, configure DHCP options. See Configuring DHCP Server Options on page 101. 8. Click Apply. A warning message appears. 9. Click OK. A success message appears. Configuring VLANs Your NetDefend firewall allows you partition your network into several virtual LAN networks (VLANs). A VLAN is a logical network behind the NetDefend firewall. Computers in the same VLAN behave as if they were on the same physical network: traffic flows freely between them, without passing through a firewall. In contrast, traffic between a VLAN and other networks passes through the firewall and is subject to the security policy. By default, traffic from a VLAN to any other internal network (including other VLANs) is blocked. In this way, defining VLANs can increase security and reduce network congestion. For example, you can assign each division within your organization to a different VLAN, regardless of their physical location. The members of a division will be able to communicate with each other and share resources, and only members who need to communicate with other divisions will be allowed to do so. Furthermore, Chapter 5: Managing Your Network 111